Kelvin eventually falls asleep and Rheya successfully petitions Gordon to destroy her with the apparatus as she has done for her own replica(s). Gordon who maintains she merely facilitated in assisted suicide and only strives for the preservation of the humans on the station.
Kelvin and Gordon then discover a dead body stashed away in a ceiling vent in the station's cold room – Snow.
The Snow they have been interacting with is a replica.
Confronted by Gordon and Kelvin, the Snow replica explains that upon being dreamed into existence, he was attacked by the real Snow and thus killed him in self-defense.
Gradually, this version of Rheya comes to realize that she does not feel human; her memories feel artificial, in that she lacks the emotional attachment that comes with actually having lived them.
Kelvin leads this "Rheya" into an escape pod and jettisons the pod into space.